My wife had a Petri 7s for a short time in the 1970s. Frankly, I didn't like it very much. The body felt flimsy and the film transport mechanism started skipping, resulting in overlapping frames. I don't think the build quality of the 7s was as solid as some earlier Petri rangefinders. The lens was sharp, but its color rendition was warmer than I like (very noticeable in the slides I took with this camera). Finally, the large circular selenium cell around the lens gave inflated readings, which resulted in underexposed pictures. I normally don't bash cameras, but this one did not perform well for me.